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Hi,
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
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there seems to be a problem in the horizontal circuit...there is a control on the flyback transformer that is labeled "screen". (you'll have to take the back off) The flyback is the component that looks sort of round with the red high voltage lead coming out the top and connecting to the top of the picture tube.On the back of the flyback there will be 2 or 3 controls if 2 there will be 1 focus and 1 screen, if 3 there are 2 focus and 1 screen..using an insulated flat blade screwdriver, slowly turn the screen control counterclockwise to see if this will make the lines go away...if not then there is a horizontal cicuit fault and quit possibly a pincushion problem(hourglass effect)..these will need to be checked by a service shop

Hi, I am assuming
your monitor is a CRT, if that is the case then it is failing, and the cost to
repair it could be close to the price of a new one.You can check around, but my advice is
to get a new one. I hope this was helpful

Sorry Ginko, but a convergence problem would have the curves down from the top and up from the bottom. The hourglass shape is a pincushion problem. This can be as simple as a bad capacitor in the pincushion circuit.

Could you please confirm the model number so I can look up the probable part?

Yes check for fluid leakage and see if the crt's are leaking fluid down on board. if so you have to change some caps any that got wet. If not wet at all then something that was fix maybe has a solder bridge on it look carefully and see if anything out of place